The Administration page under the Advanced Parameters menu contains general options and settings on the way PrestaShop itself works. It has three sections.
This section consists of four settings:
Automatically check for module updates: you can ask PrestaShop to regularly check if there are new versions of your modules available from the Addons website. If so, the "Modules" page will display an "Update it!" button.
Check the cookie's IP address: this is an added security measure which detects the IP address of each cookie
Lifetime of front office cookie: by default, the longevity of a PrestaShop cookie is 480 hours (20 days). The following two options allow you to redefine them. You can reduce it if you feel the security of your shop depends on it.
Lifetime of back office cookie: you can reduce it if you feel the security of your shop depends on it.
This page helps you define the authorized size of uploaded files from your own team – not from your customers.
There are three options, one being general and the two others being more specific:
Maximum size for attachment: The default value is taken directly from your server's settings, but you can reduce it if necessary.
Maximum size for a downloadable product: If you sell virtual products (services, bookings and downloadable files), this setting can limit the size of the files your team can upload – and thus the size of the final product. Plan in advance so that you never leave one of your team members blocked.
Maximum size for a product's image: Likewise, you can limit the size of image that you or your team can upload to your shop. This can serve as a handy reminder that team members should strive to reduce the size of an image, as it is often not useful to upload anything more than 600x600 (which is roughly 200 kB when correctly compressed). See the "Images" preferences page for the sizes your PrestaShop installation is set to use. This has the added benefit of saving on both server space and bandwidth usage, as well as processor power (since PrestaShop resizes uploaded images to give you thumbnails and more).
Notifications are numbered bubbles that are displayed at the very top of any administration page when you have loaded it, right next to the shop's name. They display the number of new items since the last time you clicked on them.
You can choose not to receive them for some content types:
Show notifications for new orders: Clicking this notification displays the names of the users that registered since last time. From there on, you can either open any customer's single page, or open the "Customers" page to get the complete list.
Show notifications for new customers: Clicking this notification displays the number of recent orders, their amounts and the customer names. From there on, you can either open any order's single page, or open the "Orders" page to get the complete list.
Show notifications for new messages: Clicking this notification displays the emails of people who have sent you a message using the contact form on your shop. From there on, you can either open any message, or open the "Customer Service" page to get the complete list.